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A Program for a restaurant. Using C

C Question : Write a program for a restaurant. Your program should display a main menu that allows the customer to select between the breakfast menu option,lunch menu option, dinner menu option and check out option. After selected an option from the main menu, your program should continue to display a sub-menu that will show the available foods and prices for the selected meal.Your program should allow the customer to select the food and enter the order quantity. Your program should continue to allow the customer to order their food until they select the check out option in the main menu,then only your program will display the order list with the quantity, prices and total amount need to pay by the customer.

This is my coding and I need to improve it to display a receipt of items purchased , the total amount need to be paid and allow the user to enter the cash amount they are going to pay and calculate the balance for them. Please help me.




#include <stdio.h>   //header files
#include <ctype.h>
#include <windows.h>

void bfast();  // prototype's
void lunch();
void dinner();
void m_m(); 
void exit();

int num;  //global variable
float price;
float total;
char choice;
int again;

void main()
{
 m_m();
}

 
void m_m()  // main menu screen
{
 char choice = ' ' ; //local variable

  printf("                Welcome to D'10 Restaurant.          \n ");
  printf("             +============================+          \n\n");
  printf("  && Please select the meal that you would like to purchase. && \n\n");
  printf("\t\t      [A] Breakfast\n");
  printf("\t\t      [B] Lunch\n");
  printf("\t\t      [C] Dinner\n");
  printf("\t\t      [D] Exit\n\n");
  printf("Enter your choice here : ");
  scanf("%c", &choice);
  system("cls");
  
  {
  if (toupper(choice) == 'A' )
    bfast();
  else 
   if (toupper(choice) == 'B')
      lunch();
   else 
    if (toupper(choice) == 'C')
       dinner();
    else 
       if (toupper(choice) == 'D')
        exit(); 
       else 
        if (toupper(choice) != 'A' , 'B' , 'C' , 'D')
        { 
         m_m();
        }
 }
  

}
void bfast() //Breakfast Menu Screen 
{
  int choice = 0; //local variables
  int quantity = 0;
  int again = 0;
  
  fflush(stdin);
  printf("                Welcome to D'10 Restaurant.          \n ");
  printf("             +============================+          \n\n");
  printf("                  $  Breakfast Menu  $ \n\n");
  printf("  && Please select the food that you would like to purchase. && \n\n");
  printf("\t\t   [1] Toast - RM 1.00\n");
  printf("\t\t   [2] Egg Muffin - RM 1.50\n");
  printf("\t\t   [3] Nasi Lemak - RM 2.00\n");
  
  
  printf("Enter your choice here : ");
  scanf("%d", &choice);
  {
  if (choice == 1) 
   {
   printf("Enter quantity : ");
   scanf("%d", &quantity);
   total = 1.00 * quantity ;
    printf("Your total amount is RM%.2f , Please pay at the counter\n\n\n ", total); 
    printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : "); // Allows user to choose whether to check-out or buy anything else.
   scanf("%d", &again);
   system("cls");
  
    if (again == 1 )
    bfast();
    else 
     if (again == 2 )
     m_m();
   else
    if (again != 1 , 2)
    {
     printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
     exit();
    }
      }
 else 
    if ( choice == 2)
    {
    printf("Enter quantity : ");
    scanf("%d", &quantity);
    total = 1.50 * quantity ;
    printf("Your total amount is RM%.2f , Please pay at the counter\n\n\n ", total);
      printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : "); // Allows user to choose whether to check-out or buy anything else.
   scanf("%d", &again);
   system("cls");
  
    if (again == 1 )
    bfast();
    else if (again == 2 ) 
    m_m();
   else
    if (again != 1 , 2)
    {
     printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
     exit();
    }
    }
    else 
     if ( choice == 3 )
     {
     printf("Enter quantity : ");
     scanf("%d", &quantity);
     total = 2.00 * quantity ;
     printf("Your total amount is RM%.2f , Please pay at the counter\n\n\n ", total); 
         printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : "); // Allows user to choose whether to check-out or buy anything else.
      scanf("%d", &again);
      system("cls");
  
     if (again == 1 )
    {
    bfast();
     }
     else 
      if (again == 2 )
    { 
    m_m();
    }
    else
        if (again != 1 , 2)
     {
      printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
      exit();
     }
     }
     else 
     if (choice != 1 , 2 , 3 )
      {
      fflush(stdin);
      system("cls");
      printf("\n\n\t\t   Invalid Choice Entered\n\n");
      bfast();
      }
    }   
  }

void lunch() // Lunch Screen Menu
{
  int choice;  //local variables
  int quantity;
  int again;
  

  printf("                Welcome to D'10 Restaurant.          \n ");
  printf("             +============================+          \n\n");
  printf("                   $  Lunch Menu  $ \n\n");
  printf("  && Please select the food that you would like to purchase. && \n\n");
  printf("\t\t   [1] Fried Rice - RM 4.00\n");
  printf("\t\t   [2] Mee Goreng- RM 4.00\n");
  printf("\t\t   [3] Fish Head Curry with Rice - RM 5.00\n");
  
  printf("Enter your choice here : ");
  scanf("%d", &choice);
  {
  if (choice == 1) 
   {
   printf("Enter quantity : ");
   scanf("%d", &quantity);
   total = 4.00 * quantity ;
   printf("Your total amount is RM%.2f , Please pay at the counter\n\n\n ", total); 
   {
  printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : ");
  scanf("%d", &again);
  system("cls");
  if (again == 1 )
   lunch();
  else
   if (again == 2 )
    m_m();
  else
   if (again != 1 , 2)
   { 
    printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
    exit();
   }
  }
      }
 else 
    if ( choice == 2)
    {
    printf("Enter quantity : ");
    scanf("%d", &quantity);
    total = 4.00 * quantity ;
    printf("Your total amount is RM%.2f , Please pay at the counter\n\n\n ", total);
    {
  printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : ");
  scanf("%d", &again);
  system("cls");
  if (again == 1 )
   lunch();
  else 
   if (again == 2 )
    m_m();
  else
   if (again != 1 , 2)
   { 
    printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
    exit();
   }
  }
    }
    else 
     if ( choice == 3 )
     {
     printf("Enter quantity : ");
     scanf("%d", &quantity);
     total = 5.00 * quantity ;
     printf("Your total amount is RM%.2f , Please pay at the counter\n\n\n ", total);
      {
    printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : ");
    scanf("%d", &again);
    system("cls");
    if (again == 1 )
     lunch();
    else 
     if (again == 2 )
      m_m();
    else
     if (again != 1 , 2)
     { 
      printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
      exit();
     }
            }
     }

     else 
      if (choice != 1 , 2 , 3)
      {
      fflush(stdin);
      system("cls");
      printf("\n\n\t\t   Invalid Choice Entered\n\n");
      lunch();
      }
   }
     
  
   
  
}





void dinner() // Dinner Menu Screen
{
  int choice;  //local variables
  int quantity;
  int again;
  

  printf("                Welcome to D'10 Restaurant.          \n ");
  printf("             +============================+          \n\n");
  printf("                    $  Dinner Menu  $ \n\n");
  printf("  && Please select the food that you would like to purchase. && \n\n");
  printf("\t\t   [1] Chicken Chop - RM 6.50\n");
  printf("\t\t   [2] Spagetti - RM 5.50\n");
  printf("\t\t   [3] Chicken Burger - RM 3.00\n");
  
  printf("Enter your choice here : ");
  scanf("%d", &choice);
  {
  if (choice == 1) 
   {
   printf("Enter quantity : ");
   scanf("%d", &quantity);
   total = 6.50 * quantity ;
   printf("Your total amount is RM%.2f , Please pay at the counter\n ", total); 
     {
  printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : ");
  scanf("%d", &again);
  system("cls");
  if (again == 1 )
   dinner();
  else 
   if (again == 2 )
    m_m();
  else
   if (again != 1 , 2)
   { 
    printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
    exit();
   }
   
     }
      }
 else 
    if ( choice == 2)
    {
    printf("Enter quantity : ");
    scanf("%d", &quantity);
    total = 5.50 * quantity ;
    printf("Your total amount is RM%.2f , Please pay at the counter\n ", total);
      {
   printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : ");
   scanf("%d", &again);
   system("cls");
   if (again == 1 )
    dinner();
   else 
    if (again == 2 )
     m_m();
   else
    if (again != 1 , 2)
    { 
     printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
     exit();
    }  
         }
    }
    else 
     if ( choice == 3 )
     {
     printf("Enter quantity : ");
     scanf("%d", &quantity);
     total = 3.00 * quantity ;
     printf("Your total amount is RM%.2f , Please pay at the counter\n\n\n ", total);
       {
    printf("\nWould you like to buy anything else?\n[1] Yes , [2] No : ");
    scanf("%d", &again);
    system("cls");
    if (again == 1 )
     dinner();
    else 
     if (again == 2 )
      m_m();
    else
     if (again != 1 , 2)
     { 
      printf("\n\n\t\tSorry Invalid Decision Entered\n\n\n\n");
      exit();
     }
   
     }
     }

     else 
      if (choice != 1 , 2 , 3)
      {
      fflush(stdin);
      system("cls");
      printf("\n\n\t\t   Invalid Choice Entered\n\n");
      dinner();
      }
   }  
  
}

void exit()  // Exit Screen
{
  
  printf("                  Thank You Very Much          \n ");
  printf("             +============================+          \n\n");
  printf("               && Please come again. && \n\n");

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